I don't know what you want to do with the horse but here's a very inexpensive Old Man for sale in New Hampshire to a trail riding home
Black Gelding Friesian Horse for Sale in Sandown, New Hampshire | Buy This Horse at Equine.com
Isn't he adorable? He's so gray! I would totally get him but buying such an aged horse makes me paranoid.

My first horse was 23 years old and she passed away after only four months of our owning her.
I don't know if you saw this guy on Dreamhorse (he's listed as available to lease)
DreamHorse.com Horse ID: 1341787 - Vilmar Van De Weeme . Oddly enough, also located in the same town, New Hampshire.
There's also plenty of inexpensive Friesians for sale at the moment! Riding geldings for 10 to 15 K!!
Also, Melissa at US Friesian Referral is offering this Gypsy riding gelding for sale:
DreamHorse.com Horse ID: 1361196 - BRAM Awesome price! Love his white body and black head w/blue eyes!
Are you a member of
The New England Friesian Council? Might be a good idea to join if not. Mingle w/ owners in your area. Maybe one of them will have a Friesian for you to lease?
Finally, get on the Friesian-L mailing list or Yahoo Group. There are so many owners there looking to lease there horses because of the bad economy.
Good luck!